When comparing Opera Mini vs Firefox Focus, the Slant community recommends Firefox Focus for most people. In the question“What are the best Android web browsers?” Firefox Focus is ranked 13th while Opera Mini is ranked 16th. The most important reason people chose Firefox Focus is:
It automatically blocks any ad trackers and erases your browsing history which includes your passwords and cookies.
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Pros
Pro Completely free
Pro Very light weight
Great for phones with lower RAM or performance issues.
Pro Has built-in ad blocker
Pro Has a data saver
Opera mini's data saver has two modes - regular and extreme. great for people with smaller data plans when not on wifi. Has also the ability to control the quality of downloaded images and some video optimizations.
Pro Optimized for Facebook
Pro Keeps your activities private
It automatically blocks any ad trackers and erases your browsing history which includes your passwords and cookies.
Pro Good loading speed
Since it blocks ads, trackers and other things that can slow down web pages, you'll be able to browse the web faster.
Pro Simple to use
Pro Suitable as a secondary browser for everyday use
As it is very fast and private it can be used for everyday use together with a browser with your passwords and login information.
Cons
Con Doesn't support some common modern browsers functionalities
Some web pages might look a bit broken but from personal experience it doesn't happen often enough (or at all) to be a major issue.
Con Many bugs
In extreme data saving mode, it sometimes won't load page correctly.
Con Has issues while playing video
It will crash when you are playing video.
Con Notification spam
Tells you to clean the browser every single time you open it.